Rotary cutter structure



April 10, 1945. c, HAU LL R 2,373,472

ROTARY CUTTER STRUCTURE Filed Jan. 24, 1944 2 Sheets-Sheet l Aprifi 10, 1945. Q HAUMHTLER. 2,373,472

ROTARY CUTTER STIQUCTURE F iled Jan. 24, 1944 2 Sheets-Sheet 2 Patented Apr. 10, 1945 UNITED STATES PATENT OFFICE RDTARY CUTTER STRUCTURE Charles Haumill' er, Elgin, Ill. I s I Application January 24, 1944, SerialNor5l9;5' l3kvm 3 Claims. (Cl. 164-60) My invention relates to a rotary work performing structure andmorepartlcularly to one which is adapted for cutting pipe; tubing, barsor the like.

Among the more important objects of the invention are to provide improved supporting structure for the rotatable cutting head; to provide an improved arrangement for the cutting tool supporting ring andthe cam ring for setting the cutting tool; to simplify the construction of the cutter head parts so that they may be more readily assembled; to provide improved means for feeding piping, tubing or bars to be cut; and in general to produce a more simple cutter structure of the type referred to which can beeconomically manufactured and which will accurately and emciently effect the cutting. Y

The various features of my invention are embodied in the structure shown on the drawings in which:

Figure 1 is a plan view of a cutter structure;

Figure 2 is an enlarged section on planeII-II ofFigurel;

r, and the work. This clamping engagement may be maintained by holding the lever 2i swung out. or a spring 23 may be inserted between the collar l9 and the end of the spindle H to hold the chuck tube in to maintain attaching engagement with 10 the hub with the work when the lever M is released. After a cutting operation, the lever H is swung to shift the chuck tube out to release its clamping engagement with the work so that the work can be fed out for the nextcutting operation. The end of the spindle ll outside of the annular shoulder l2-thereon. is threaded to receive a bushing 24, which abuts the shoulder. .This bushing mounts the inner ring of a ball bearing assembly whose outer ring receives the cutter supporting ring 26 of the cutter head H. Atits outer endthis cutter ring has the annular flange 21 which extends radially inwardly in front ofthe bushing 24 and which provides the passageway 28 through which the work W may be extended.

driving gears therefor with g oover plate 25 At its inner end the cutter ring 25 has theradially removed; v

Figure 4 is an enlarged side elevation of the cutting tool;

Figure 5 is an enlarged section on plan X-X,

Figure 2; I

Figure 6 is a section on plan VI-VI of Figure 5; and

Figure (is a view similar to Figure 3 showing a modified form of cam ring.

Referring to Figures 1 and 2, a supporting frame III has a spindle H extending therethrough provided with an annular shoulder l2 near its outer end ,for engaging the outer side of the frame; nuts I8 engaging the threaded outer end cfgthe spindle toabut. theframe to clamp the spindle thereto. Movable; longitudinally within the bore of the spindle is chuck tube It whose outer portion has the frusto-conical surface l5 for cobperationwiththe frusto-conical surface ii of the outer end of the spindle bore, the outer portion of the chuck tube having longitudinally extending slots 11. The work W, shown in the form of a tube, is inserted throughthe chuck tube to be securely held while it is being out. A collar 18 securedto the inner end of the chuck tube has the circumferential channel is for receiving the pins 20 extending from a lever 2| fulcrumed 30 flange 29 on the cutter neg? Thecamring extends outwardly'with its outer face flush with the outer face of thefcutter ring flange 21." 'I'hecam r outwardly extending flange 29 having the exter ring is of slightly greater external diameter than the gear flange 29 and its inner end has the gear ring and provides a series of cam surfaces 34 on its inner side, Figure 3 showing threesuch cam surfaces. The cutter ring flange 21 has a radially extendingslot 35 in'its'outez. side for receiving the cutting tool holder 36,5This holder is of recr- -tangular cross-section and at its outer end is bifurcated to receive acam roller 31 .iournalled on a pin 38. At its inner end the holder is bifurcated to receive a cutter wheel 39 Journalled on the pin Ill. The outer end of the cutter holder projects into the channel 33 for engagement 01' I the cam roller 3'! with the cam surfaces 34; In

the arrangementshown'on Figures 3; 5 and 6, a

spring-4| tends to holdthe holder out with its cam roller-against the cam surface.- The spring shown is a coil spring within a recess 42 adjacent to the slot 35. the sprin surrounding and being anchored at one end to, the shank or a screw 43,

holder between the bifurcation arms thereof, as

i shown-on-Figuresfi and 6.

die H and has keyed to its outer end a gearpin'- ion 45 meshing the teeth 32 on the cam ring 3|.

The gear pinion I6 is geared on the hubof the gear pinion 4i and meshes with the teeth on the cutter ring 26. The shaft 44 may be turned by hand or by, a belt (not shown) engaging the pulley l'l secured to the inner end of the shaft. The shaft 44 is rotated for counterclockwise rotation of the cutter ring and cam ring, and with the gearing arrangement shown. the cutter ring will rotate slightly faster than the gear ring. The gearing arrangement may be such that, after one revolution of the rings,

- the cutter ring will be a distance of two teeth ahead of the cam ring. It will thus require a 20 radially w ly xtending flange at its inner number of reiLolutions for passage r th e W end provided with gear teeth, said cutter ring at rollf onthe cutter holder along the full length of one of the cam surfaces 34. Referring to Figure ,3,'the cam, roller is at the starting end of one of the cam surfaces. For a considerable distance along the cam surface, about one-half the dis- "tance as shown on Figure 3, the-cam surface is idle as during such extent its radius from the axis against am or dust.

creasing radius -and',at its end b the radius the free end of the spring engaging ainst the which holds cutter structure in the slot will not be subjected to lateral strain.

In the modified arrangement shown by Figur 7 cam-waysor channels 5| are provided whose opposite parallel surfaces engage the cam roller of the cutting tool thus making unnecessary the application of spring means for holding the cutter 36 outwardly.

I have thus produced a simple economically manufactured and efllcient cutter structure, but I do not desire to be limited to the exact construction and arrangement shown and described as changes in modification may be made without departing from the scope of the invention.

I claim as follows:

1. A rotary cutter structure for the purpose described comprising a hollow support through which the article to be out is fed, a cutter ring rapidly increases. Thuaduring the differential rotation of the rings, the cutteristructure -36 will be held out a while until the cam roller engages with the part, a of the cam surface and then the cutter will ,be shifted radially inwardly for application of lts'cutting wheel 39 to the work W for the cutting operation. v After the cutting operation, when the cam roller reaches the end b ofthe cam surface, the cutter will be shifted out journaled on-the end of said support and having its outer end having a radially inwardly extend ing annular flange integral therewith and provided with a radial slot in itsouter side, a tool holder movalble in said slot and having a cam roiler at itsiouteraend and a cutting tool at its inner end, a cam ring journaled on said cutter ring and having a, cam channel in its outer end surrounding the outer flange of said cutter ring, said cam channel presenting cam surfaces for engagement by said roller to eifect radial shift of said tool holder during difierential rotation of said rings, said cam ring at its innerend having away from the work by the spring 4| forengagement of the cam roller with the end of the next cam surface. During the period of engagement of the cam roller with the idleportion of a cam surface, theoperator will have time to operate the chucktubefiffcihdvancement of the work W and reclamping thereof for the next cut.

- Although I have shown onlyone cutter, more could be employed. For example, where there are three cam surfaces on the cam ring, three cutters could be; mounted on the cutter ring spaced 120 degrees apart." The'cutters are held in 'tl'ieslot's 35 by an end plate 4 8 covering the outer ends of the slots and extending across the camchannel "and having the passageway 49 in alignment with the passageway 28 of the cutter ring flange 21.. The plate is detachably secured to the flange 21 as by screws 50. When the plate is secured in place, it will hold the cutter or cutters 35' in their slotsumd will also hold the cam ring-in place on the cutter ring and the spring its recess 42. The plate serves also to seal cam channel 33,.andthe slots 3 ii-spring abuts at its outer end against the cam surfaces in the cam ring, the cam pressure is directly radially inwardly against the cutter body and the cutter tool solthat'the cutter structure will not be subjected to lateral strain in the guide slot in the integral cutter ring,

having a radially extending slot therein, a tool gear teeth thereon, gears engaging the teeth on said cutter ring and cam ring respectively for differential rotation of said rings, and an annular plate detachably secured against the outer end ofthe outer flange of said cutter ring and engaging the 'outerend of said cam ringfor closing w the outer side of said cam channel and for holding said cam ring positioned on said cutter ring between the plate and the inner flange of said cutter ring.

2. A rotary cutter for the purpose described comprising a hollow support through which work to be cut may be fed, a cutter ring having an outwardly extending radial flange at its inner end and an inwardly extending radial flange .at its outerend integral therewith, said outer flange holder movable in said slot and having a cam roller at its outer end and a cutter tool at its inner end, a cam ring surrounding and joumaled on sald'cutter ring and having a channel at. its

outer e1 d surrounding said outer flange on the cutter ring and presenting cam surfaces for engagement bys'aid roller to effect radial shift of said tool holder during differential rotation of said rings, means for effectingsuch differential outer flange of said cu tterzringfa spiral spring witbimfsaid recess anchored at one end to said 0 rotation, a circular recess in the outeLsldeof-the'f outer flange and having its other end extended into said slot againstfsaidtool holder tending to shift said tool holder outwardly for engage-' ment of the cam rollerwith the cam surfaces, and an annular plate detachably secured against the outer face of said outer-flange for closing the outer-side of said-toolholder slot and said cam channel and said spring recess-and for holding said cam ring against axial displacement between the plate and the cutter ring inner flange.

3. A rotarycutter structure for the purpose described. comprising a stationary hollow spindle d. the plate 48 s through which workto be cut may be fed, the

outer end of said spindle being screw threaded,

a supporting ring detachably screw threaded on said threaded end of the spindle, the inner race of a ball bearing mounted on said supporting ring; a cutter ring receiving the outer race of said ball bearing and having an outwardly extending radial flange at its inner end integral therewith and at its outer end having a radially inwardly extending flange integral therewith and engaging said support ring to hold said ball bearing aligned'ithereon, said outer flange having a radially extending slotin its outer side, a tool holder movable in said slot and terminating at its inner end in a cutting tool, a cam ring receiving and. rotatable on said cutter ring and having an annular channel at its outer side presenting cam surfaces, a recess in the outer side of said outer flange and a spring therein engaging said tool holder for shifting it outwardly for engagement of its outer end with said cam surfaces, an annular plate detachably secured against the outer face of said outer flange'to form a closure CHAS. HA i a 

